package com.hmdp.service.impl;

import com.hmdp.dto.Result;
import com.hmdp.entity.SeckillVoucher;
import com.hmdp.entity.VoucherOrder;
import com.hmdp.mapper.VoucherOrderMapper;
import com.hmdp.service.ISeckillVoucherService;
import com.hmdp.service.IVoucherOrderService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.utils.RedisIdWorker;
import com.hmdp.utils.SimpleRedisLock;
import com.hmdp.utils.UserHolder;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.aop.framework.AopContext;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;
import java.time.LocalDateTime;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class VoucherOrderServiceImpl extends ServiceImpl<VoucherOrderMapper, VoucherOrder> implements IVoucherOrderService {
    @Resource
    private ISeckillVoucherService seckillVoucherService;
    @Autowired
    private RedisIdWorker redisIdWorker;
    private static final String ORDER_PREFIX = "lock:order:";
    @Autowired
    private StringRedisTemplate stringRedisTemplate;
    @Resource
    private RedissonClient redissonClient;

    @Override
    public Result seckillVoucher(Long voucherId) {
        SeckillVoucher voucher = seckillVoucherService.getById(voucherId);      //查询优惠券
        if(voucher.getBeginTime().isAfter(LocalDateTime.now())){                //判断秒杀是否开始
            return Result.fail("秒杀尚未开始");
        }
        if(voucher.getEndTime().isBefore(LocalDateTime.now())){                 //判断秒杀是否结束
            return Result.fail("秒杀已经结束");
        }
        if(voucher.getStock()<1){                                               //判断苦难是否充足
            return Result.fail("库存不足");
        }
        Long userId = UserHolder.getUser().getId();

//        SimpleRedisLock lock = new SimpleRedisLock(ORDER_PREFIX + userId, stringRedisTemplate);
        RLock lock = redissonClient.getLock(ORDER_PREFIX + userId);
        boolean isLock = lock.tryLock();             //设置超时时间
        if(!isLock){
            return Result.fail("不允许重复下单");
        }
        try{
            IVoucherOrderService proxy = (IVoucherOrderService)AopContext.currentProxy();
            return  proxy.createVoucherOrder(voucherId);
        }finally {
            lock.unlock();
        }

        //        给每个用户加锁
//        synchronized(userId.toString().intern()){
//            IVoucherOrderService proxy = (IVoucherOrderService)AopContext.currentProxy();
//            return  proxy.createVoucherOrder(voucherId);
//        }

    }

    @Transactional
    @Override
    public Result createVoucherOrder(Long voucherId) {
        Long userId = UserHolder.getUser().getId();

        boolean secuess = seckillVoucherService.update().setSql("stock=stock-1").eq("voucher_id", voucherId).gt("stock",0).update();
        if(!secuess){
            return Result.fail("库存不足");
        }
        int count = query().eq("user_id", userId).eq("voucher", voucherId).count();
        if(count > 0){
            return Result.fail("限购一次");
        }
        VoucherOrder voucherOrder = new VoucherOrder();
        Long orderId = redisIdWorker.nextId("order");
        voucherOrder.setId(orderId);
        voucherOrder.setUserId(userId);
        voucherOrder.setVoucherId(voucherId);
        save(voucherOrder);
        return Result.ok(orderId);

    }
}
